I thought as I received notable words from Wordnik's Word of the Day service, I'd post them here. If you like, sign-up for Wordnik's Word of the Day service yourself.
(adj) Composed by candle-light; pertaining to nocturnal study or serious thought.
This word comes from the Latin 'lucubrare', to work by lamplight. To 'lucubrate' means 'to study earnestly or laboriously, as by candle-light.'